Methods and systems for dynamically adjusting frequency offsets for mitigating interference

1. A method carried out by a mobile radio that is configured to use an adjustable transmit frequency, the method comprising: estimating an expected base-station-receive power level with respect to transmissions from the mobile radio to a base station; adjusting the transmit frequency to be a center frequency of a radio channel plus a default frequency offset responsive to the estimated expected base-station-receive power level being less than a first threshold; adjusting the transmit frequency to be the center frequency plus a modified frequency offset responsive to the estimated expected base-station-receive power level being greater than a second threshold, the modified frequency offset being greater in magnitude than the default frequency offset; and transmitting an uplink signal to the base station over the adjusted transmit frequency; including an indication of an expected base-station-receive power level from the base station, wherein the indication of the expected base-station-receive power level is a base-station-measured received signal strength indicator (RSSI) of an earlier uplink signal previously received by the base station from the mobile radio.

2. The method of claim 1 , wherein the radio channel is a shared radio channel.

3. The method of claim 2 , wherein the shared radio channel is a 25-kHz- wide channel.

4. The method of claim 3 , wherein the default frequency offset has a magnitude of 6.25 kHz.

5. The method of claim 1 , wherein the default frequency offset has a magnitude of zero.

6. The method of claim 1 , wherein the modified frequency offset has a magnitude that exceeds the magnitude of the default frequency offset by 1.4 kHz.

7. The method of claim 1 , further comprising selecting the magnitude of the modified frequency offset based at least in part on the estimated expected base-station-recieve power level.

8. The method of claim 1 , wherein the mobile radio comprises a user interface, the method further comprising receiving, via the user interface, one or both of the magnitude of the default frequency offset and a signum of the default frequency offset.

9. The method of claim 1 , further comprising receiving, from the base station, one or both of the magnitude of the default frequency offset and a signum of the default frequency offset.

10. The method of claim 9 , wherein receiving from the base station comprises receiving via a control channel.

11. The method of claim 1 , wherein the default frequency offset and the modified frequency offset have values that are either both positive or both negative.

12. The method of claim 1 , further comprising: receiving a downlink signal from the base station; and determining a mobile-radio-received power level of the received downlink signal, wherein the mobile radio estimates the expected base-station-receive power level based at least in part on the determined mobile-radio-received power level of the received downlink signal.

13. The method of claim 12 , wherein the mobile radio determines the mobile-radio-received power level of the received downlink signal at least in part by measuring a received signal strength indicator (RSSI) of the received downlink signal.

14. The method of claim 1 , wherein the mobile radio estimates the expected base-station-receive power level based at least in part on a comparative relationship between respective transmit powers of the base station and the mobile radio.

15. The method of claim 1 , wherein the mobile radio estimates the expected base-station-receive power level based at least in part on a comparative relationship between respective transmit frequencies of the base station and the mobile radio.

16. The method of claim 1 , wherein the mobile radio estimates the expected base-station-receive power level based at least in part on a comparative relationship between respective locations of the base station and the mobile radio.

17. The method of claim 16 , wherein one or both of the location of the base station and the location of the mobile radio is determined using one or more of a satellite-based geo-positioning system, a wireless-network infrastructure user-equipment-location prediction, and an active Wi-Fi connection and a list of in-range Wi-Fi signals.

18. A mobile radio that is configured to use an adjustable transmit frequency that is offset from a center frequency of a radio channel, the mobile radio comprising: a communication interface; a processor; and data storage containing instructions executable by the processor for causing the system to carry out a set of functions, the set of functions including: estimating an expected base-station-receive power level with respect to transmissions from the mobile radio to a base station; adjusting the transmit frequency of the communication interface to be the center frequency plus a default frequency offset responsive to the estimated expected base-station-receive power level being less than a first threshold; adjusting the transmit frequency of the communication interface to be the center frequency plus a modified frequency offset responsive to the estimated expected base-station-receive power level being greater than a second threshold, the modified frequency offset being greater in magnitude than the default frequency offset; and transmitting, via the communication interface, an uplink signal to the base station over the adjusted transmit frequency including an indication of an expected base-station-receive power level from the base station, wherein the indication of the expected base-station-receive power level is a base-station-measured received signal strength indicator (RSSI) of an earlier uplink signal previously received by the base station from the mobile radio.